Abstract
In this paper, a double-layer aperiodic metallic grating is designed and the focusing performance is numerically researched using the finite-difference time-domain method. A sub-wavelength focusing spot is achieved and the depth of focus is twice the length of the incident wavelength. With its ease of fabrication, the designed aperiodic double-layer metallic grating has great potential in applications such as data storage, laser direct writing and optical probe.
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